Google has announced Google gears which attempts to take browser offline. At present, it supports Google reader and very likely it would start supporting gmail and google docs in near future. This development is in sync with the announcement of mozilla to support offline browsing in firefox 3.0. This application being open source can be used by other developers and soon we would see a number of sites allowing offline access to data. If implemented in google docs, it would be a huge advantage over other competitors providing similar service.